Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3284425 A
Publication typeGrant
Publication date8 Nov 1966
Filing date15 May 1964
Priority date22 Mar 1958
Also published asDE1088231B
Publication numberUS 3284425 A, US 3284425A, US-A-3284425, US3284425 A, US3284425A
InventorsSchroder Gunter, Tessmar Ruth Helene
Original AssigneeRoehm & Haas Gmbh
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Conversion of polymethacrylate to polymethacrylimide in an aqueous system
US 3284425 A
Abstract  available in
Images(3)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

United States Patent 3,284,425 CONVERSKUN 0F POLYMETHACRYLATE T0 POLYMETHACRYLHMIDE IN AN AQUEOUS SYSTEM Giinter Schriider, Darrnstadt, Germany, and Klaus Tessmar, deceased, late of Darmstadt, Germany, by Ruth Helene Tessmar, widow and sole heir, Darrnstadt, Germany, assignors to Rollin & Haas G.m.b.H., Darmstadt, Germany No Drawing. Filed May 15, 1964, Ser. No. 368,452 Claims priority, application Germany, Mar. 26, 1959, R 25,227 6 Claims. (Cl. 260--89.5)

This application is a continua-tion-in-part of application Serial No. 16,656 filed Mar-ch 22, 1960, now abandoned.

This invention relates to nitrogenous derivatives of polyrnethacrylate, and to methods of making the same, and relates in particular to polymethacrylimide polymers and methods of making the same.

US. Patent 2,146,209 to Graves teaches methods for producing polymethacrylimide materials by the treatment of polymethylmethacrylate with amines and/ or ammonia. The reaction is performed in the presence or absence of organic solvents, and a small amount of water may be employed as a catalyst.

P. J. Flory has statistically analyzed the cyclization reaction occurring in this imide formation in J. Am. Chem. Soc. 61, 1518-1521 (1939), and has shown that a maximum of about 86 percent of the carboxyl (ester) groups of an acrylic (acrylate) polymer will participate in imide formation. As will be pointed out hereinafter, the reactions reported in the Graves patent by way of example experimentally corroborate these calculations.

According to the present invention, polymethacrylate homopolymers and copolymers are treated with dilute aqueous solutions of amines, alone or together with ammonia. Surprisingly, in the presence of relatively large amounts of water, polymethacrylimide products are formed which are substantially free of carboxy or ester groups, i.e. in which the degree of imidization is at least about 95 percent, a figure in excess of both the theoretical calculated maximum and the maximum experimentally found by Graves. Because of the scarcity of carboxy groups in the products prepared by the present invention, the materials are more highly resistant to alkali than those produced by prior art processes.

Although the applicants do not know the cause for this higher degree of imidization, it is possible that, in the presence of large amounts of water and under the reaction conditions prevailing, the imide groups first formed by the reaction of the invention are in dynamic equilibrium with non-cyclic species. That is, rather than being temporally and spatially fixed on the polymer molecule, the imide rings continually open and close and Wander along the polymer until substantially all of the groups capable of imidization have been imidized. Where such an equilibrium is not possible, a single acid or ester group may become isolated between adjacent imide rings, as was envisioned by Flory in the aforementioned article, resulting in a lower overall degree of imidization.

Aqueous solutions of aliphatic, heterocyclic, and araliphatic amines having two hydrogen atoms on the amine nitrogen atom can be used in practicing the present invention. Exemplary of such materials are amines such 3,284,425 Patented Nov. 8, 1966 ice as n-decyl amine, n-dodecyl amine, n-cetyl amine, and n-octadecyl amine.

The amines are employed as aqueous solutions containing between about 1 percent by weight and 30 percent by weight of amine. If aqueous ammoniacal solutions of the amines are used, the solutions may additionally contain up to about 10 percent by weight of ammonia. Suitably, sumcient solution is used so that an amount of amine, or of amine and ammonia, is present which is at least equivalent to the imide forming groups of the polymer being treated.

The polymers being treated are heated with these aqueous solutions at temperatures of between 180 C. and 300 C. The reaction is commonly carried out in an autoclave under autogenous pressure which varies with the temperature used and the amount and concentration of amine present. In general, pressures between about 8 and about atmospheres, suitably from about 8 to 40 atmospheres, are preferred during treatment, but the pressures are not critical. The treatment may vary in duration from /2 hour to 7 hours, depending on the degree of conversion desired, the temperature used, and the amount and concentration of amine, for example. Such considerations are common to all chemical reactions and are within the skill of the art.

The invention is particularly useful when applied to homopolymers of methylmethacrylate, but copolymers of methylmetlracrylate with methacrylic acid and/or with one or more methacrylic acid derivatives such as methacrylonitrile, methacrylamide, Nlower alkyl methacrylamides such as N-methyl, N-ethyl, N-propyl, and N-butyl methacrylamides, methacrylic acid chloride, or ammonium methacrylate can also be treated. These comonomeric materials, present in a copolyrner with methylmethacrylate, will imidize under the reaction conditions to form the polymethacrylimide polymers of the invention. One or more of these comonomeric materials may be present, with methylmethacrylate, in amounts up to percent by weight of the polymer treated. Particularly convenient starting materials are homopolymers of meth ylmethacrylate, as mentioned, or copolymers of this material with from about 10 up to about 50 percent by weight of one or more of the comonomers mentioned earlier.

The treatment of methylmethacrylate homopolymers and copolymers with an aqueous solution of a primary amine gives products which, in contrast to the products obtained in the prior art, are extremely difiicult to hydrolyze. When hydrolysis is accomplished under strenuous conditions such as high temperature and strongly alkaline media, the products obtained, when used as soil conditioners, are characterized by an especially high persistence and an eifectiveness extending for a period of several years.

The products obtained by treating methylmethacrylate homopolymers and copolymers with an aqueous solution of primary amines according to the invention are waterinsoluble and alkali-resistant, but can be dissolved in suitable solvents, for example in a mixture of dimethyl formamide and formic acid, and can then be used for the production of polymer films according to methods known to the art. As another possibility, dried products obtained according to the process can be pressed. The films, as Well as the pressed products, are characterized by a high resistance to deformation by heat even at temperatures higher than 200 C., and notably exceed the behavior of the polymethylmethacrylate starting products in thisrespect.

In accordance with a preferred embodiment of the invention, products which are particularly readily susceptible to filtration are obtained when polymethylmethacrylate is treated with primary and/or secondary amines in an aqueous solution of an electrolyte, for example, calcium chloride or ammonium sulfate.

The advantages and utility of the method of the invention will be further apparent from the following examples which illustrate typical specific methods within the scope of the invention and set forth the best modes now contemplated of practicing the invention. It is to be understood that these examples are illustrative only and that numerous changes can be made in the materials, preparations and conditions described without departing from the invention. The parts are by weight unless specified otherwise.

Example 1 120 grams of rough milled polymethylmethacrylate were heated for 7 hours at 230 C. in a tubular autoclave with 192 grams of a 33 /3 percent aqueous solution of methylamine and 780 grams of water. A pressure between about 30 atmospheres and 36 atmospheres was maintained. The reaction product comprised a watery phase and a polymer phase insoluble in water, aqueous ammonia, and most organic solvents. The solid product had a nitrogen content of 8.4 percent and a OCH content of 0.2 percent. The product is extraordinarily resistant to aqueous alkali. For example, it is not attacked by immersion at 90 C. in a percent sodium hydroxide solution for a period of 8 hours.

Example 2 120 grams of granulated polymethylmethacrylate were heated at 270 C., with stirring, for 7 hours in a stainless steel autoclave with 149 grams of butyl amine and 910 grams of water. A maximum pressure of 55 atmospheres was attained.

After cooling, a solid, yellow-white mass insoluble in water and in dilute ammonia was obtained. This mass was dissolved in dimethyl formamide. By drying the solution, a glass-clear colorless film of poly-N-butyl methacrylimide was obtained. By analysis, the polymer had a methoxy group content of 0.3 percent, which corresponds with 1 percent by weight of unreacted methylmethacrylate units. Determination of the acid number gave a carboxyl group content of 0.6 percent.

Elemental analysis gave the following values:

250 grams of a coarsely divided copolymer containing 60 percent by weight of methylmethacrylate and 40 percent by weight of N-methylmet-hacrylamide were heated with stirring in a stainless steel autoclave for 4 hours at 250 C. with 500 grams of a 6 percent aqueous solution of methyl amine. The reaction product is a yellow-white water-insoluble mass which, after drying, was pressed into a test plate. The resistance of this material to deformation by heat according to the method of Vicat was 173 C. The nitrogen content was 8.4 percent (the calculated value for poly-N-methylmethacrylimide is 8.4 percent).

A determination of the acid number indicated 1.2 percent by weight of methacrylic acid units. Based on the methoxyl content, 1 percent by weight of methylmethacrylate units had not reacted.

4;- Example 4 1 gram of a copolymer comprising 71.3 mol percent of methylmethacrylate and 28.7 mol percent of methacrylonitrile were heated for 7 hours at 270 C. in an autoclave with 0.75 gram of methyl amine and 5 grams of water. The reaction product had the same properties and gave the same elementary analysis as did the poly-N-methylmethacrylimide of the previous example.

Example 5 35 grams of a copolymer comprising 55 mol percent of methylmethacrylate and 45 mol percent of N-isopropyl methacrylamide were heated for 4 hours in an autoclave at 270 C. with 500 grams of a 2 percent aqueous solution of isopropyl amine. The reaction product is a yellowwhite mass insoluble in water and aqueous ammonia.

A methoxy group determination indicated the presence of 0.02 percent by weight of unreacted methylmethacrylate units. Determination of the acid number indicated 1.8 percent by weight of methacrylic acid units. The nitrogen content of the reaction product amounted to 7.0 percent (the calculated value for pure poly-N-isopropyl methacrylimide is 7.3 percent).

Example 6 TABLE Corresponding Mol Percent Exlarmple We1ght Percent Imide Irnide Comonomer 4 50.5 dodeeyl imide.-. 39 61% methylmethacrylate. 5 68.8 cetyl imide 55 45% methylmethacrylate. 6 67.2 octodecyl unide... 50 50% methylmethacrylate. 7 88 butyl imide 86 14% methacrylic acid.

9 86.5 dodecyl imide 81 19% methylmethacrylate.

Examples 2, 3, and 8 of Graves do not contain sufiicient data for analysis. Example 1 of the Graves patent reports a polymer containing 8.71 percent of nitrogen. The conclusion, reached by Graves from this figure, that the polymer is primarily polymethacrylic acid imide appears incorrect. For example, the polymer is reported to be soluble in dilute ammonia, but polymethacrylic acid imide is known to be insoluble in ammonia. While the nitrogen analysis is probably correct, the product obtained is most likely a copolymer consisting in part of methacrylimide, of methacrylamide, and of ammonium methacrylate.

What is claimed is:

1. The method of making water-insoluble alkali-resistant polymethacrylimides which are substantially free of carboxy groups and wherein the degree of imidization of said polymethacrylimides is at least 95 percent, which method comprises heating, at a temperature between about 180 C. and 300 C. and at a pressure of about 8 to about 85 atmospheres, a member selected from the group consisting of homopolymers of methyl methacrylate and copolymers of methyl methacrylate with up to percent by weight of a comonomer selected from the group consisting of methacrylic acid, Inethacrylonitrile, methacrylamide, methacrylamides of primary lower alkyl monoamines having 1 to 4 carbon atoms, methacrylic acid chloride, and ammonium methacrylate, with an aqueous solution containing from about 1 to about 30 percent, by weight of said solution, of a primary aliphatic monoamine, sufiicient solution being used so that an amount of monoamine at least equivalent to the imideforming groups of the polymer being treated is present.

2. The method as in claim 1 wherein the reaction is performed at a pressure between about 8 atmospheres and about 40 atmospheres.

3. The method as in claim 1 wherein a homopolymer of methylrnethacrylate is treated.

4. The method as in claim 1 wherein a copolymer of methylmethacrylate is treated.

5. The method as in claim 1 wherein said primary aliphatic monoamine is a lower alkyl amine.

6. The method as in claim 1 wherein said solution additionally contains up to 10 percent, by weight of said solution, of ammonia.

References Cited by the Examiner UNITED STATES PATENTS 2/1939 Graves 260-72 8/1957 Roth 260-80.3 12/1957 Shearer 26080.3 7/1958 Melamed 260-86.1 12/1959 Ayers 260-89.5 5/1962 Rauch et al. 26089.5

FOREIGN PATENTS 8/ 1959 Great Britain.

15 H. WONG,

Assistant Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2146209 *31 Jul 19367 Feb 1939Du PontPreparation of resinous imides of substituted acrylic acids
US2801985 *18 May 19566 Aug 1957American Cyanamid CoSoil stabilization
US2816083 *29 Apr 195410 Dec 1957Eastman Kodak CoMethod of conditioning soils and conditioning agents therefor
US2845408 *4 Aug 195429 Jul 1958Rohm & HaasLinear polymeric amides and methods of making them
US2915481 *4 Dec 19511 Dec 1959Pure Oil CoAcrylic resins modified with alkanolamines
US3033782 *28 Jan 19588 May 1962Roehm & Haas GmbhPolymeric agglomerating agents
GB818249A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4246374 *23 Apr 197920 Jan 1981Rohm And Haas CompanyImidized acrylic polymers
US4727117 *27 Aug 198523 Feb 1988Rohm And Haas CompanyImide polymers
US4745159 *20 Jan 198717 May 1988Mitsubishi Rayon Co., Ltd.Methacrylate resin composition and process for its preparation
US4816524 *29 Apr 198628 Mar 1989Mitsubishi Rayon Company LimitedImidation a poly(meth)acrylic acid or ester
US4927893 *12 Sep 198922 May 1990Mitsubishi Rayon Co., Ltd.Process for producing methacrylimide group-containing polymer
US4954574 *19 Dec 19894 Sep 1990Rohm And Haas CompanyGlutarimide polymers
US4954575 *28 Dec 19894 Sep 1990Mitsubishi Rayon Company, LimitedMethacrylimide containing polymer
US5004777 *24 May 19902 Apr 1991Rohm And Haas CompanyImide polymers
US5006609 *9 Jan 19909 Apr 1991Basf AktiengesellschaftReacting ethylene copolymer with ammonia
US5023302 *28 Aug 198911 Jun 1991Mitsubishi Rayon Company, Ltd.Process for preparation of methacrylimide group containing polymer and light-transmitting fiber comprising polymer made by the process
US5073606 *15 Apr 199117 Dec 1991Mitsubishi Rayon Company, LimitedMethacrylimide containing polymer
US5096976 *28 Dec 198917 Mar 1992Mitsubishi Rayon Co., Ltd.Methacrylimide-containing polymer
US5132371 *11 Dec 198921 Jul 1992Mitsubishi Rayon Company Ltd.Methacrylimide-containing polymer and thermoplastic resin composition comprising this polymer
US5135985 *10 May 19914 Aug 1992Rohm GmbhEngineering thermoplastics; high glass transition temperature; degrees of imidation; methcrylic acid and anhydride units
US5146535 *15 Apr 19918 Sep 1992Mitsubishi Rayon Company Ltd.Light-transmitting fiber
US5264483 *10 Jan 199123 Nov 1993Rohm And Haas CompanyImide polymers
US5350808 *21 Dec 199227 Sep 1994Basf AktiengesellschaftPoly(meth)acrylimides with different n-substitutes
US5360872 *22 Oct 19931 Nov 1994The Geon CompanyPolyimides
US5369189 *28 Dec 199029 Nov 1994Lucky, Ltd.Process for the preparation of heat resistant and transparent acrylic resin
US5378765 *12 Nov 19933 Jan 1995Basf AktiengesellschaftN-aryl-substituted poly (meth) acrylimides
US5416142 *20 May 199416 May 1995Oatey CompanyMethod of bonding and bonding compositions
US5420209 *4 Oct 199330 May 1995Elf Atochem S.A.Controlled formation of amine salt before imidation, optical applications
US5530071 *22 Feb 199425 Jun 1996Elf Atochem S.A.Preparation of imide-modified methyl methacrylate (MMA) polymer/copolymers
US5604278 *20 Feb 199618 Feb 1997The B. F. Goodrich CompanyA blend for extrusion of pipe comprising an acrylic polymeric impact modifier graft copolymers; tensile strength, heat resistance
US630326031 Mar 200016 Oct 2001Microchem Corp.Useful for a lift-off resist in a bilayer metal lift-off process
US639544931 Mar 200028 May 2002Microchem Corp.Mixture containing polyglutarimide and solvent
US658656018 Sep 20011 Jul 2003Microchem Corp.Alkaline soluble maleimide-containing polymers
US75923856 May 200522 Sep 2009Oatey Companysolvent cement for bonding polyvinyl chloride, chlorinated polyvinyl chloride and crylonitrile-butadiene-styrene plastic pipes, containing polymethyl methacrylate and a solvent mixture of methyl ethyl ketone and acetone capable of dissolving acrylic resin and dissolving surface of plastic pipe surfaces
US844508929 Nov 201121 May 2013E I Du Pont De Nemours And CompanyPolyoxymethylene modified with imidized acrylic resins
US86919178 Oct 20108 Apr 2014E I Du Pont De Nemours And CompanyIonomers modified with imidized acrylic resins
DE2652118A1 *16 Nov 19762 Jun 1977Rohm & HaasImidhaltige polymerisate und verfahren zu ihrer herstellung
EP0076691A15 Oct 198213 Apr 1983Rohm And Haas CompanyAnhydride polymers and imide polymers and processes for preparing them
EP0155567A2 *1 Mar 198525 Sep 1985Mitsubishi Rayon Co., Ltd.Light-transmitting fiber
EP0200530A2 *29 Apr 19865 Nov 1986Mitsubishi Rayon Co., Ltd.Process for preparing methacrylimide-containing polymers
EP0216505A2 *21 Aug 19861 Apr 1987Rohm And Haas CompanyPolyimides, preparation of polyimides and blends of polyimides
EP0234726A2 *22 Jan 19872 Sep 1987Mitsubishi Rayon Co., Ltd.Methacrylate resin composition and process for its preparation
EP0331052A2 *24 Feb 19896 Sep 1989ELF ATOCHEM ITALIA S.r.l.Process for the preparation of imidized acrylic polymers
EP0373610A2 *12 Dec 198920 Jun 1990Mitsubishi Rayon Co., Ltd.Methacrylimide-containing polymer and thermoplastic resin composition comprising this polymer
EP0376750A2 *29 Dec 19894 Jul 1990Mitsubishi Rayon Co., Ltd.Methacrylimide containing polymer
EP0548657A1 *8 Dec 199230 Jun 1993BASF AktiengesellschaftPoly(meth)acrylimides having different N-substituents
EP0549922A1 *8 Dec 19927 Jul 1993BASF AktiengesellschaftN-Aryl substituted poly(meth)acrylimide
EP0591025A1 *16 Sep 19936 Apr 1994Elf Atochem S.A.Process for the manufacture of glutarimide copolymers and intermediate compounds thereof
WO1991009886A1 *28 Dec 199011 Jul 1991Lucky LtdA process for the preparation of heat resistant and transparent acrylic resin
WO2004083281A15 Mar 200430 Sep 2004Dong-Ryul KimA process for preparation of polyglutarimide resin using a fluid of super critical condition
WO2012047972A15 Oct 201112 Apr 2012E. I. Du Pont De Nemours And CompanyIonomers modified with imidized acrylic resins
Classifications
U.S. Classification525/378, 525/329.4, 525/329.9, 525/330.5, 525/328.2, 526/312, 525/329.2
International ClassificationC08F8/00, B01D15/04
Cooperative ClassificationC08F8/00
European ClassificationC08F8/00